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Closes #23369 Feishu may redeliver the same message during WebSocket reconnects or process restarts. The existing in-memory dedup map is lost on restart, so duplicates slip through. This adds a dual-layer dedup strategy: - Memory cache (fast synchronous path, unchanged capacity) - Filesystem store (~/.openclaw/feishu/dedup/) that survives restarts TTL is extended from 30 min to 24 h. Disk writes use atomic rename and probabilistic cleanup to keep each per-account file under 10 k entries. Disk errors are caught and logged — message handling falls back to memory-only behaviour so it is never blocked.